A goiter is caused by a deficiency in ____
a. thyroxine
b. triiodothyronine
c. calcium
d. iodine
e. both thyroxine and triiodothyronine
ANSWER: d
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You experimentally change the DNA sequence directly upstream of a start codon of an operon in E. coli to investigate the function of this region of DNA
Analysis reveals that after the change the same amount of mRNA is made from the operon, but there are very few proteins made from the operon. What is the most likely function of the DNA sequence that you changed? A) The DNA sequence likely functions as a ribosome-binding site. B) The DNA sequence likely functions as a promoter. C) The DNA sequence likely functions as a termination sequence. D) The DNA sequence likely functions as in transcriptional regulation.
Examine the flux diagrams in Figure 25.6 to address the following questions. What is the difference in the rate of carbon exchange (in gigatons per year of carbon) between photosynthesis and respiration in the marine environment?
What will be an ideal response?
In an experiment to distinguish genetic versus environmental effects on a trait, the test individuals
A) should be as genetically related as possible. B) should have variable alleles at as many loci as possible. C) must have the same parents. D) must be grown in a natural environment.
Which of the following hormones is exclusively
female? a. follicle-stimulating hormone b. luteinizing hormone c. progesterone d. follicle-stimulating hormone and progesterone e. follicle-stimulating hormone, progesterone, and luteinizing hormone