Which of the following is an indirect method for estimating the number of microbes in a sample?
A) viable plate counts
B) turbidity
C) Coulter counter
D) MPN
E) membrane filtration
B
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The scientists use a virus to insert the new DNA into the cabbage plant’s DNA. The insect
pests would be considered __________.
a. primary producers b. primary consumers c. secondary consumers d. tertiary consumers
At the start of translation the initiator tRNA is base paired with the start codon at ____ in the
ribosome.
a. the A site (aminoacyl site) b. first the A site (aminoacyl site) and then the E site (exit site) c. the P site (peptidyl site) d. first the A site (aminoacyl site) and then the P site (peptidyl site) e. the E site (exit site)
Which statements are true for chloroplasts?
a) They contain the green pigment chlorophyll. b) They are the sites of reactions that convert solar energy into chemical energy. c) Their inner membrane has infoldings called cristae. d) Their matrix contains enzymes that function in cellular respiration. e) They are the sites of reactions that convert chemical energy to ATP. f) They have membranous sacs called thylakoids that are surrounded by a fluid called stroma.
If a pair of homologous chromosomes fails to separate during anaphase of meiosis I, what will be the chromosome number of the four resulting gametes with respect to the normal haploid number (n)?
A) n + 1; n + 1; n - 1; n - 1 B) n + 1; n - 1; n; n C) n + 1; n - 1; n - 1; n - 1 D) n + 1; n + 1; n; n E) n - 1; n - 1; n;n