The idea that femaleness is simply what happens when an embryo does not develop as a male is no longer supported by evidence because of the discovery of
A) the SRY gene in females.
B) genes whose expression is necessary for female structures to develop.
C) gene that suppress all of the genes on a female's Y chromosome.
D) hormones that suppress expression of SRY genes in females.
B) genes whose expression is necessary for female structures to develop.
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Medicines containing hormones affect developing in the fetus
a) lungs b) brain structures c) limbs d) muscles
The p700 photosystem is designated as photosystem
“I” because it a. absorbs light energy first. b. absorbs more energy than photosystem II. c. is the primary photosystem. d. is thought to have evolved first. e. obtains electrons before photosystem II.
Which of the following statements concerning ATP is FALSE?
a. It is a nucleotide.
b. It stores energy for long periods. c. It is called the energy currency of the cell. d. It contains phosphate groups joined in a series. e. It contains phosphate groups joined by unstable bonds.
Natural selection acts only on traits that are _____.
A. advantageous in a certain environment B. disadvantageous C. advantageous D. heritable