Which of the following is the correct order for the synthesis of the plant cell wall, from the outermost layer to the innermost layer?
A) middle lamella; primary cell wall; secondary cell wall; plasma membrane
B) primary cell wall; middle lamella; secondary cell wall; plasma membrane
C) plasma membrane; secondary cell wall; primary cell wall; middle lamella
D) middle lamella; secondary cell wall; primary cell wall; middle lamella
E) primary cell wall; secondary cell wall; plasma membrane; middle lamella
A) middle lamella; primary cell wall; secondary cell wall; plasma membrane
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The genes needed for ?-carotene synthesis are not normally expressed in endosperm. In the creation of golden rice, how did researchers ensure that these genes were expressed in rice endosperm?
A) The genes were injected only in the endosperm of rice grains. B) Agrobacterium cells were added only to rice grains, not to any other part of the plant. C) The protein-coding sequence of each gene was linked to a regulatory region of DNA that directed transcription in endosperm. D) The wild-type genes were mutated and new mutant alleles that are expressed only in endosperm were selected.
The primary ecological function of fungi is that of ________.
A. consumer B. decomposer C. pathogen D. producer
A control group
a. receives the same treatment as the experimental group. b. is an untreated group of individuals or subjects. c. is sometimes exposed to harsh conditions. d. is often an unnecessary waste of material. e. is not subjected to experimental error
The dominant herbivores in savannas are
A) gophers. B) insects. C) antelope. D) giraffes.