BIOLOGY HIGH SCHOOL

The typical order of steps in the scientific method is ____. hypothesis, theory, law
observation, law, theory, hypothesis
observation, hypothesis, experiment, conclusion
there is no rhyme or reason to how science is done

Answers

Answer 1
Answer: observation-recognize that there is a problem or something you want to know ,hypothesis-gather fact and make a guess ,experiment-test your guess,conclusion-final result

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Which of the following statements best describes the major difference between prophase I of meiosis and prophase of mitosis?A. In prophase I, tetrads of homologous chromosomes form and crossing over occurs.B. In prophase, the nuclear membrane dissolves and spindle fibers attach to the chromosomes.C. In prophase I, the chromatin condenses to form visible chromosomes.D. In prophase, the replicated chromosomes are linked together as sister chromatids.

what are the three components of a nucleotide? what are their relevant pkas? how do they connect to each other?

Answers

Answer:

A nucleotide is composed of three components: a nitrogenous base, a sugar molecule, and a phosphate group.

Explanation:

1. Nitrogenous Base: There are two types of nitrogenous bases found in nucleotides: purines and pyrimidines. Purines include adenine (A) and guanine (G), while pyrimidines include cytosine (C), thymine (T), and uracil (U) in RNA. These nitrogenous bases have different pKa values: adenine and guanine have pKa values around 3.5, while cytosine, thymine, and uracil have pKa values around 4.5.

2. Sugar Molecule: The sugar molecule in a nucleotide is either deoxyribose (in DNA) or ribose (in RNA). Deoxyribose and ribose are both five-carbon sugars. Deoxyribose has a hydrogen atom at the 2' carbon position, while ribose has a hydroxyl group (OH) at the same position. The pKa of the sugar molecule is not relevant to the connection between nucleotides.

3. Phosphate Group: The phosphate group consists of a phosphorus atom bonded to four oxygen atoms. One oxygen is connected to the 5' carbon of the sugar molecule, forming a phosphodiester bond. The pKa of the phosphate group is around 1.

The three components of a nucleotide connect to each other through covalent bonds. The nitrogenous base is connected to the 1' carbon of the sugar molecule, forming a glycosidic bond. The phosphate group is connected to the 5' carbon of the sugar molecule through a phosphodiester bond. This connection repeats in a linear fashion, forming a chain of nucleotides. In DNA, this chain forms the double helix structure through hydrogen bonding between complementary nitrogenous bases (A with T and G with C), while in RNA, the chain remains single-stranded.

To summarize, the three components of a nucleotide are the nitrogenous base, the sugar molecule, and the phosphate group. The relevant pKa values are around 3.5 for adenine and guanine, around 4.5 for cytosine, thymine, and uracil, and around 1 for the phosphate group. These components connect to each other through glycosidic bonds between the base and the sugar, and phosphodiester bonds between the sugar and the phosphate group.

A successful biologist’s main interest area would be _____.a. the 21
b. scientific
c. 4
d. social

Answers

A successful biologist's main interest are would be scientific

scientific !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

A protective, waterproofing structure consisting of several cuticle layers is the __________.a. endoskeleton
b. exoskeleton
c. labium
d. ocelli

Answers

The answer is exoskeleton.

The major light absorbing pigment in green plant photosynthesis isA) rhodophyll.
B) chlorophyll.
C) cytochrome a.
D) cytochrome c.

Answers

The Chlorophyll. This is the pigment responsible for the green colors of a green plant, and its the one that lets this plant absorb energy from the light, letting the plant to do its photosynthesis.

Hope this Helps! :)
the answer is B because chlorophyll gives plants the color to be green

Flatworms have a concentration of nerve tissue and organs in one end of the body. what is the name of this characteristic,

Answers

Answer:

The correct answer is cephalization.

Explanation:

Being a evolutionary feat, cephalization is umbrella term for concentration of sense organs such as eyes and ears, feeding organs such as mouth and nervous system such as ganglia, brain and cerebellum. For flatworms the ganglia concentrated in one end of the body which is "nerve tissue" in your question.
This is called cephalization. In mammals, this cephalization occurs primarily in the head...brain, eyes, ears, mouth.

What is the second phase of mitosis

Answers

Answer:

Metaphase

Explanation:

During metaphase, parts of the spindle extend and the chromosomes align at the middle part of the cell. Notice that each chromosome consists of two identical strands held together at a point in the middle.

-Therefore, metaphase is the second stage of mitosis
Metaphase

The second stage of mitosis. In this stage the chromosomes line up across the center of the cell and become connected to the spindle fiber at their centromere.
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