Which of the following describes the sepal of a flower?
a. a modified leaf that encloses the bud
b. a long thin structure that links the stigma to the ovary
c. a thin stalk that links the anther to the flower’s base
d. a sac-like structure at the tip of the stamen
a. a modified leaf that encloses the bud
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Which of the following statements about the mRNA start codon is INCORRECT?
A. The start codon is only a few nucleotides from the ribosomal binding site. B. The start codon is usually GGA. C. The start codon is usually AUG. D. The start codon specifies the amino acid methionine. E. The start codon defines the reading frame.
Triplo-X syndrome is when a woman has an extra X chromosome. Using your knowledge of chromosomal inheritance, which of the following statements is most likely to be correct?
a) A woman with three X chromosomes produces oocytes with two X chromosomes, which could result in her giving birth to a XXY son. b) Women with this condition are usually marked by profound mental impairment. c) This condition does not exist because a fetus with three X chromosomes cannot survive birth. d) Women with this disease are able to give birth to normal children with the normal number of sex chromosomes. e) Both a) and d) are likely to be correct.
To test the prediction that increased phosphorous levels in lakes lead to increased minnow populations, scientists survey 20 lakes across Minnesota, measuring phosphorous content and quantifying minnow abundances. This is an example of what type of scientific approach?
What will be an ideal response?
Enzymes are composed of:
A) nucleotides. B) sucrose molecules. C) glucose molecules. D) glucose and sucrose molecules. E) amino acids.