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topjm [15]
2 years ago
8

Most animals on earth are __________ ( vertebrates or invertebrates ).

Biology
1 answer:
andre [41]2 years ago
8 0

Answer:

vertebrates

Explanation:

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Why are identical twins rare?
barxatty [35]

Answer:

Tbh I don’t really know but I think it’s because the sperm has to fertilize one egg and then that egg separates into two, creating two IDENTICAL kids

Explanation:

8 0
3 years ago
A scientist wants to compare DNA of two plants. What technique can she use to produce bands of DNA fragments for this comparison
Xelga [282]

It's Gel electrophoresis. Just took the test!

-Jazzy

7 0
3 years ago
What is hypertension and what are some factors that affect it?
tigry1 [53]
A condition in which the force of the blood against the artery walls is too high.
Usually hypertension is defined as blood pressure above 140/90, and is considered severe if the pressure is above 180/120.
5 0
3 years ago
You want to determine whether short wings in fruit flies are the result of a dominant or recessive mutation. You cross a short-w
Natalka [10]

Answer:

a dominant mutation

Explanation:

A monohybrid testcross is a cross-breeding experiment used to determine if an individual exhibiting a dominant phenotype is homo-zygous dominant or heterozygous for a particular phenotypic trait (in this case, wing length). In a monohybrid testcross, a 1:1 phenotypic ratio shows that the dominant parental phenotype was a heterozygote for a single gene that has complete dominance. Moreover, a 3:1 ratio in the F2 is expected of a cross between heterozygous F1 individuals, which means that 75% of individuals with short wings have the dominant allele that masks the expression of the long-wing trait (i.e. the recessive allele).

4 0
2 years ago
Explain the role of enzymes as biological catalysts that lower the activation energy of a reaction.
tia_tia [17]

Answer:

Enzymes are one kind of protein which functioning as catalyst  that speed up reactions by lowering activation energy.Enzyme accelerate a reaction without altering its chemical equilibrium.

Explanation:

Energy which is required for  start a biochemical reaction is called activation energy.Activation Energy helps to jump and start a thermodynamically favorable reactions.

Enzymes can  many  way to its activation energy.

1. The enzyme may hold the substrates in such a way as to distort the substrate bonds closer to their form in the transition state. This reduces the amount of energy needed to complete the transition.

2.Enzyme create a charge distributor which opposite of transition state his lowers the energy of the transition state and decreases the activation energy.

3.The enzyme may reduce the reaction entropy   by bringing substrates together in the correct orientation to react.

4. The enzyme may provide a completely different chemical pathway for the reaction. It may form new bonds in the ES complex that would be difficult to form without the enzyme.

6 0
3 years ago
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