Which scientist(s) discovered the basis for the
base-pair rule, which stated that the amounts of
adenine in all DNA are the same, as are the
amounts of cytosine and guanine?
a. Watson and Crick
b. Beadles
c. Chargaff
d. Franklin
e. Pauling
C
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When a steroid hormone and a peptide hormone exert similar effects on a population of target cells, then _____
A) the steroid and peptide hormones must use the same biochemical mechanisms B) the steroid and peptide hormones must bind to the same receptor protein C) the steroid hormones affect the synthesis of effector proteins, whereas peptide hormones activate effector proteins already present in the cell D) the steroid hormones affect the activity of certain proteins within the cell, whereas peptide hormones directly affect the processing of mRNA E) the steroid hormones affect only the release of proteins from the target cell, whereas peptide hormones affect only the synthesis of proteins that remain in the target cell
How do we know that the atmosphere of the earth experienced an increase in O2 and became oxidizing between 2.5 and 2 billion years ago?
What will be an ideal response?
In the cross AaBbCc × AaBbCc, what is the probability of producing the genotype AABBCC?
A) 1/4 B) 1/8 C) 1/16 D) 1/64
Which stage of the demographic transition results in the greatest population growth?
A. pre-industrial stage B. transitional stage C. industrial stage D. post-industrial stage E. post-apocalyptic stage