Without the greenhouse effect, the Earth would
A) be much warmer than it currently is.
B) be much colder than it currently is.
C) have uniform temperatures and would lack seasons.
D) have constant sunlight.
B
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Which one of the following statements about DNA is incorrect?
A. DNA typically exists in cells as a double helix. B. There are 10 base pairs per turn in a helical DNA molecule. C. DNA has a diameter of approximately 2 nanometers. D. The strands in DNA wrap around each other in a helix that coils to the right. E. All of the statements about DNA are correct.
What is the component of heme within hemoglobin whose absence can lead to anemia?
a. iron b. iodine c. calcium d. zinc e. magnesium
A maternal effect mutation bicoid (bcd) is recessive. The bcd allele makes no Bicoid protein. In the absence of the Bicoid protein, product embryogenesis is not completed and eggs fail to hatch into viable larva
Consider a cross between a female who is heterozygous (bcd+/bcd) and a homozygous mutant male (bcd/bcd). a. How is it possible for a male homozygous for the mutation to exist? b. Predict the outcome (normal and/or failed embryogenesis) in the F1 and F2 generations resulting from this cross.
Polyploidy is:
a. the presence of more than two of a certain chromosome. b. more than two of a certain chromosome. c. more than one chromosome. d. the presence of multiple sets of chromosomes. e. the general term for conditions such as Down or Turner syndrome