If a bird eats an insect that ate a plant, the bird is considered a(n)
A) autotroph.
B) producer.
C) secondary consumer.
D) primary consumer.
E) tertiary consumer.
C
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Lederberg and Tatum used the bacterial strains bio- met- leu+ thr+ thi+ and bio+ met+ leu- thr- thi- in their
experiments to determine if genetic recombination occurs in bacteria. Would it have been better to use two strains with the genotypes met- leu+ and met+ leu- instead?
a. Yes, because it is easier to study 2 genes than 5 genes. b. Yes, because the met- leu+ and met+ leu- strains only have one mutation, which makes it easier for genetic recombination to occur. c. No, because the met- leu+ and met+ leu- strains only have one mutation. A single random mutation could restore methionine or leucine synthesis in the strains. d. No, because strains with only one nutrient-deficient gene can still grow on minimal medium. e. No, because cells have two genes that encode different versions of leucine, so the met+ leu- strain would still be able to grow on minimal medium.
If a mutated DNA sequence produces a protein that differs in one central amino acid from the normal protein, which of the following kinds of mutations could have occurred? View Available Hint(s) If a mutated DNA sequence produces a protein that differs in one central amino acid from the normal protein, which of the following kinds of mutations could have occurred?
a. A deletion mutation. b. An addition mutation c. None. d. An addition mutation and a deletion mutation.
Birds and reptiles save water by eliminating __________ rich wastes as uric acid crystals. Fill in the blank(s) with the appropriate word(s)
The term eukaryotic means ____
a. having many nuclei b. before the nucleus c. having a true nucleus d. not having a nucleus e. not having DNA