Streptococcus pyogenes is a human pathogen that is typically treatable with penicillin. Given this information, which of the following statements is true?
A. S. pyogenes is a gram negative bacterium
B. S. pyogenes cells are spheres
C. S. pyogenens is a protist
D. S. pyogenes is in the domain, Archaea
E. Answers A and B
F. Answers B and D
Answer: A. S. pyogenes is a gram negative bacterium
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Which statement describes a primary mutant screen?
A) A researcher uses CRISPR to create mutations in mouse homologs of three genes that function in heart development in the fruit fly. B) A scientist uses RNAi to simultaneously knock down the expression of two genes in C. elegans to determine whether they function redundantly. C) A scientist examines a large number of mutagenized zebrafish embryos for abnormalities in blood vessel formation. D) A researcher treats a large number of Arabidopsis plants with different chemicals to determine which chemicals inhibit plant growth.
A cellular molecular pathway by which an external signal is converted into a functional response is
called ________________. Fill in the blank(s) with the appropriate word(s).
In his monohybrid crosses, Mendel deduced that one trait was recessive because that trait was ____
a. not present in the F1 and did not reappear in the F2 b. present in the F1 and in the F2 c. not present in the F1 and reappeared in the F2 d. present only in the parents e. present only in the F2
The structure labeled 2 in Figure 28-1 is the:
a. stigma.
b. style.
c. receptacle.
d. ovary.
e. filament.