The stimulus for the formation of the gray crescent is
a. provided by the RNA transcripts in the egg.
b. the entry of the sperm.
c. the responsibility of oocyte components.
d. determined by the polarity of the egg.
e. the cleavage of the zygote.
Answer: b
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If you needed to determine the order of genes on a chromosome, you should perform
A. a test cross. B. a two-point cross. C. a three-point cross. D. a SNP test.
The two major categories of extracellular signal molecules that bind to cell surface receptors are ____
a. peptide hormones and steroid hormones b. steroid hormones and neurotransmitters c. neurotransmitters and vitamins d. growth hormones and vitamins e. peptide hormones and neurotransmitters
It took 3 million years for the human population to reach 1 billion, 123 years to grow to 2 billion, and
12 years to grow from 6 to 7 billion.
Indicate whether the statement is true or false.Which of the following is found in every nucleotide?
a. ribose b. a single phosphate group c. a single carbon ring d. a double nitrogen ring e. nitrogen