Which of the following is shaped in a double helix?

a) chromatin

b) mitochondria

c) DNA molecules

d) endoplasmic reticulum

e) RNA molecule

What is the sperm cells flagella an adaptation for

Which phrase best describes a process represented in the diagram below fertilizated egg and multicelluar organism?

Select all that apply. Which molecules need facilitated diffusion to move across the plasma membrane?

Which term describes all scavengers? A. consumer B. producer C. herbivore D. omnivore

What is another name for the classification system of classifying living things?

Which molecule is synthesized by plants and is a major source of energy for plants and animals?

A biology student wants to understand how blood flows through the aorta. To model the heart and aorta, she sets up two identical pressure-controlled tanks that push blood through a 2-centimeter diameter tube. Her results are shown in the table below.

Which characteristic should describe all evidence collected by a scientis

What macromolecule is the primary energy source for organisms?

What is the difference between diploid and haploid cells?