Imagine you discover a yeast mutant that exhibits a general inability to grow and thrive compared to wild-type yeast. You predict that the mutant has a defect in a basic process necessary for survival and therefore examine the cellular levels of 200 common proteins, as well as the levels of tRNAs and rRNAs. You discover that tRNA and rRNA levels are normal, but the levels of all of the proteins you examine are much lower than they are in the wild-type yeast. This suggests that there is a general defect in:

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Answer 1

Answer:

Answer:

Some of the other process of gene expression

Explanation:

If the tRNA and rRNA levels are normal we can assume that the translation machinery is working properly. So, this suggest that the defect might appear in some of the previous steps of gene expression: replication, transcription, mRNA processing.

Gene expression is a set of processes that occur in the cell and that use information from the genetic material (gene) to produce gene product (e.g. protein). Gene expression is highly controlled and regulated because it is critical for an organism's development.

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Three of the most prominent definitions of species are the biological species concept, the phylogenetic species concept, and the morphological species (morphospecies) concept. Match each characteristic with the species concept(s) to which it applies. Species:1. biological2. morphological3. phylogenetic4. morphological and phylogenetic5. biological, morphological and phylogeneticCharacteristics: 1) accommodates asexual reproduction 2) not applicable for extinct species 3) relies on similarities of structures 4) used by scientists in classification 5) species acceptance criteria can be subjective6) based on evolutionary history
Which of the following statements about tRNA is FALSE? A. tRNAs of both eukaryotes and prokaryotes share common features. B. The two-dimensional structure of tRNAs exhibits a cloverleaf pattern. C. tRNAs are produced in the nucleus. D. functional tRNAs have been spliced by splicesomes. E. tRNAs possess an anticodon complementary to the codon.
Identify a dependent variable measured in the researcher’s experiment. Identify one control that the researcher could use to improve the validity of the experiment. Justify the researcher analyzing blood samples at many intermediate time points instead of at only the beginning and the end of the 20-week period. BoldItalicUnderline
What’s substance produces as a result of a chemical reaction?

When orange iodine is exposed to starch it turns blue-black. In an experiment, you placed a cornstarch solution in a small plastic bag. Next, you placed the the bag in a beaker of water containing 10 drops of iodine. If the solution in the plastic bag turned blue-black (Check all that apply)a. the plastic bag was permeable to cornstarch.
b. the plastic bag was permeable to iodine.
c. the iodine moved into the plastic bag.
d. the cornstarch moved into the beaker.
e. the plastic bag was selectively perme

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More sounds like C than the others

3. Prokaryotic cells are found in the fossil record _______ years ago.

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Answer:

4.5 billion years ago

Explanation:

this is correct i guess

How does carbon-14 dating work?

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Answer:

Plants and animals assimilate carbon-14 from carbon dioxide throughout their life. When they die, they stop exchanging carbon with the biosphere and their carbon-14 content begins to decrease at a rate determined by the law of radioactive decay.

Radiocarbon dating is basically a method designed to measure residual radioactivity.

Explanation:

Carbon-14 is a weakly radioactive carbon isotope; It is also known as radiocarbon, and is an isotopic stopwatch.

Radiocarbon dating is only applicable to organic materials and some inorganic materials (not applicable to metals).

Proportional gas counting, liquid scintillation counting, and accelerator mass spectrometry are the three main methods of radiocarbon dating.

The radiocarbon, or carbon-14, is an isotope of the carbon element that is unstable and weakly radioactive. The stable isotopes are carbon-12 and carbon-13.

Carbon 14 is continuously formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen-14 atoms, rapidly oxidizing in the air to form carbon dioxide and entering the global carbon cycle.

Accelerator mass spectrometry (AMS) is a modern method of radiocarbon dating that is considered the most efficient way to measure the radiocarbon content of a sample. In this method, the content of carbon-14 is measured directly in relation to carbon-12 and carbon-13 present. The method does not take into account beta particles, but the number of carbon atoms present in the sample and the proportion of the isotopes.

The food web for a particular ecosystem is shown below.Greenhopper
Gras
Duck
Ant
Lizard
Frog
Tadpole
Snake
Sunlight
Algse
Bacteria
Decayed
Matter
Earthworm
What would most likely happen i the grasshopper population had a major increase?
A. The frog population would decrease.
B. The snake population would increase
c. The duck population would decrease,
D. The lizard population would not change.

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Answer:

The snake population would increase.

Explanation:

Answer:

Explanation:

Just had the question

Which of the following is/are true? A. Sympatric speciation is best described as a random event that disrupts the allele frequencies in a population.
B. Red headed females in a population will only breed with red headed males. The yellow headed females will only breed with yellow headed males. The red and yellow populations live on separate continents and rarely met in nature. The red and yellow could breed and produce fertile offspring but they normally do not. This would be an example of sympatric speciation.
C. Sympatric speciation does not require geographic isolation.
D. Red headed females in a population will only breed with red headed males. The yellow headed females will only breed with yellow headed males. This population lives in the same geographic area. The red and yellow individuals could breed and produce fertile offspring but they normally do not. This would be an example of sympatric speciation.
E. Sympatric speciation can be due to sexual(mate) selection

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Answer: Options A, C and E are correct

A) Sympatric speciation is best described as a random event that disrupts the allele frequencies in a population

C) Sympatric speciation does not require geographic isolation.

E) Sympatric speciation can be due to sexual(mate) selection

Explanation:

Sympatric speciation is the situation whereby organisms of the same species:

- live in the same territory or nearby territories ( i.e not living in isolation)

- DO NOT interbreed, but select a sexual mate from a much diverse territory which results in an uneven gene flow or disruption of alleles in new species or offsprings of such parents organisms.

Erythrocytes might the best of example of form equals function because they lack many organelles. What organelles are absent in erythrocytes?

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Mature mammalian red blood cells lack nuclei, mitochondria and rough endoplasmic reticulum, they do not contain DNA and consequently, cannot divide. They also cannot synthesise RNA nor synthesise any new proteins, and consequently, have a limited lifespan. Mature red blood cells circulate for about 100–120 days in the body before they are removed by the spleen.

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