BIOLOGY COLLEGE

Which of the following is a role of helper t cellsA( To ingest pathogens
B( to destroy cells that have been infected by viruses
C( to activate B Cells
D( to increase blood flow

Answers

Answer 1
Answer: A to ingest pathogens
Answer 2
Answer: The answer to this question is C( to activate B cells

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Scientist can determine the age of ancient objects by a method called radiocarbon dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope of carbon, 14C, with a half-life of about 5730 years. Vegetation absorbs carbon dioxide through the atmosphere and animal life assimilates 14C through food chains. When a plant or animal dies, it stops replacing its carbon and the amount of 14C begins to decrease through radioactive decay. Therefore, the level of radioactivity must also decay exponentially. A parchment fragment was discovered that had about 64% as much 14C radioactivity as does plant material on Earth today. Estimate the age of the parchment. (Round your answer to the nearest hundred years.) yr

Transcription occurs along a ____ template forming an mRNA in the ____ direction. (0.5 pts.) A) 5' to 3'; 5' to 3' B) 5' to 3'; 3' to 5' C) 3' to 5'; 5' to 3' D) 3' to 5'; 3' to 5'

Answers

Transcription occurs along a 3'-5' template forming an mRNA in the 5'-3' direction.

WHAT IS TRANSCRIPTION:

  • Transcription is the process by which a mRNA molecule is synthesized from a DNA template.

  • Transcription occurs in the nucleus of eukaryotic organisms where the information stored in the DNA molecule is used to produce a complementary mRNA sequence that conveys it to the ribosome.

  • Transcription occurs in the 3'-5' direction, and since the mRNA molecule is complementary, it'll be in the 5'-3' direction.

Therefore, transcription occurs along a 3'-5' template forming an mRNA in the 5'-3' direction.

Learn more about transcription at: brainly.com/question/15175461

Answer:

3' to 5'; 5' to 3'

Explanation:

The DNA strand with 3' to 5' polarity serves as a template for the process of transcription. Using the 3' to 5' DNA template strand, the enzyme RNA polymerase catalyzes the formation of RNA.  The ribonucleotides are bonded together by phosphodiester bonds that are formed in 5' to 3' direction only. The formation of RNA occurs in 5' to 3' direction. The DNA template strand has a complementary nucleotide sequence to the newly synthesized RNA.

A serve the two plants which cellular change affected the structure of second plant

Answers

The difference in second plant from the first one is rigidity. Second one is wilted and not rigid. This is due to the release of water from the vacuoles in the cell of plants

What is the total magnification of a microscope with one lens that has a magnification of 20 and a second lens that has a magnification of 40? A. 800 B. 60 C. 40 D. 80​

Answers

Answer:

B 60

Explanation:

20+40=60 ❤️ ❤️ ❤️ ❤️ ❤️ ❤️ ❤️ ❤️

Filled-in symbols in the pedigree that follows designate individuals suffering from deafness.a. (2 points) Study the pedigree and explain how deafness is being inherited.b. (2 points) What is the genotype of the individuals in generation V

Answers

Deafness is an autosomal recessive disorder as the first generation is unaffected and the genotype of the fifth generation is AaBb.

What are pedigree and genotype?

Pedigree is a chart representation of the phenotype of specific genes of the organism and its inheritance from the ancestral family. The pedigree can be used for the analysis of the heritable disease and illness in the family root.

The deafness illness in the pedigree is recessive as the first generation of the pedigree remains unaffected but the later generation is affected and is diseased.

From the chart, deafness can be said to be an autosomalrecessive disorder as some generations are unaffected and in some the disease is present. More than one gene is controlling the disease as the fifth and sixth generations are affected but not their offspring.

The parent of the fifth generation are affected but their progenies are normal to know the genotype let's assume the genes A and B to be responsible for the disease and the mutation in any one of the alleles will result in deafness.

Hence, the genotype of the parents 5 and 6 in the fourth generation will be AAbb and aaBB as both of them diseased or deaf, the offsprings produced from their cross will be AaBb that is all the offspring of the fifth generation will be normal and unaffected.

Therefore, the genotype of the fifth generation in the pedigree is AaBb.

Learn more about pedigree and autosomal recessive disorder here:

brainly.com/question/14543085

Answer:

According to the pedigree, It is clear that the F1 generation is not affected but their offspring are affected in F2, which explains that the deafness presented with the pedigree is recessive. It should be an Autosomal recessive inheritance as it is found in both male and female offsprings.

As it is found that the parents are affected in 5th gen and 6th generation but their offspring are not affected which means there must be more than one genes controlled this disorder

B. In 5th generations mentioned above offspring is unaffected but parents are affected, to find the genotype of the individual let assume there are two genes responsible for it A and B, and mutation in any one of them can result in deafness.

So in IV generation Individuals 5 and 6 have genotypeAAbb and aaBB; both are deaf.

gametes:- Ab & aB.

So, the genotype of all offsprings will be AaBb means all are normal.

Pink eye is a recessive trait found in deer mice. In a cross between two individuals, both of whom are heterozygous for the pink eye mutation, the following offspring are obtained:Normal 18

Pink eye 2

Use the chi-square test to determine if the observed numbers of offspring fit the expected numbers of offspring from this cross. The value of is: ____________

Answers

Answer:

See the answer below

Explanation:

If pink eye is recessive, it means that the normal eye is the dominant trait. According to Mendelian law, the ratio of normal to pink eye in a cross involving two heterozygous mice should be 3:1.

Chi-square = ((O - E)^2)/(E) where O = observed frequency and E = expected frequency.

Phenotype      Observed            Expected          Chi-square

Normal                 18                3/4 x 20 = 15          ((18 - 15)^2)/(15) = 0.6

Pink                       2                  1/4 x 20 = 5           ((2 - 5)^2)/(5) = 1.8

Total Chi-square = 0.6 + 1.8 = 2.4

Degree of freedom = 2 - 1 = 1

Critical Chi-square value at 95% = 3.841

The critical Chi-square value is more than the calculated value. Hence, the observed number of offspring fits the expected number of offspring.

Which of the following would be the last step in the process of DNA fingerprinting? A DNA sample is obtained.
B. Restriction fragments are separated.
C. Restriction enzymes are used to cut DNA into fragments.
D. DNA fragments containing repeats are labeled with radioactive probes.

Answers

Answer:

(D). DNA fragments containing repeats are labeled with radioactive probes.

Explanation:

DNA fingerprinting can be defined as a process, which involves identification of DNA characteristics of an organism as unique in all organisms as fingerprints.

There are total five steps in DNA fingerprinting, which includeisolation of DNA from the cells, digestion of DNA with restriction enzymes, separation of DNA fragments in agarose gel, transfer of DNA fragments to a blotting paper, and labeling of DNA fragments with radioactive probes of specific sequence to see the results.

Thus, the correct answer is option (D) as represents that last step of DNA fingerprinting.

D. Fingerprinting involves binding radioactive probes to label DNA that has been digested by an endonuclease and separated out
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