A dna molecule has a unique design that resembles a spiral staircase. scientists call this design a a. double helix. b. spiral structure. c. double nucleotide. d. spiral purine.

14. According to Model 3. what is the stimulus and what is the response cuting childbirth

The science of classifying organisms based on shared future is

Explain why your weight in pounds is much lighter on the moon but your mass is the same? (Gravitational force on the moon is 1.6N)

The sodium - potassium pump usually pumps

Which best describes the testes? a. They produce hormones and sperm. b. They are the male copulatrry organ. c. They give sperm nourishment and motility. d. They are the pouch-like skin that protects the scrotum.

Which is true about enzymes? Question 20 options: They act on nonspecific, randomly chosen substrates. After a reaction, they cannot be reused. They can speed up metabolic processes in the body. They cannot change shape.

Why does the meiosis produce cells with only half the amount of DNA? How does this aid in the formation of a healthy zygote?

Which way does the sun's gravity act on any body in orbit? A. pulls it forward in its orbit B. pulls it backward in its orbit C. pulls it toward the sun

Which two processes result in variations in sexually reproducing species? (1) mutation and genetic recombination (2) mitosis and natural selection (3) extinction and gene replacement (4) selective breeding and cloning

How was the amount of food caught by a heron related to change in biotic and abiotic factors?