Which of the following eukaryotes typically have cell walls? (Check all that apply.)
A. Fungi
B. Plants
C. Protozoa
D. Algae
E. Animals
Answer: D
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The DNA sequence which corresponds to a specific protein product is referred to as a ____
Some help with this please?
Choose the option that places the following events in plant defense in the correct order:
1. Plant cell recognizes double-stranded RNA (dsRNA) as foreign and cleaves it into fragments. 2. Single-stranded RNA (ssRNA) molecules bind to the protein-bound small interfering RNA (siRNA) and are destroyed. 3. A virus infects the host plant, injecting ssRNA into the cell. 4. Viral genome is replicated and dsRNA molecules are formed. 5. siRNA bind to a plant protein complex, which retains only one of the RNA strands. A. 3 2 1 4 5 B. 1 2 4 3 5 C. 5 3 4 2 1 D. 1 2 3 4 5 E. 3 4 1 5 2
The major function of a receptor is to
a. control the autonomic functions of the body. b. stabilize the internal environment to achieve homeostasis. c. produce responses to the various stimuli the body receives. d. give organisms or cells awareness of and sensitivity to their environment. e. do none of these.
A testcross involves
a. two F1 hybrids. b. an F1 hybrid and an F2 offspring. c. two parental organisms. d. an F1 hybrid and the homozygous dominant parent. e. an F1 hybrid and an organism that is homozygous recessive for that trait.