Barbara McClintock identified corn mutants with the unstable mutant phenotype with what pattern of color?
What will be an ideal response?
colorless with purple spots
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Answer the following statements true (T) or false (F)
1. Genes that are expressed only when needed are called constitutive genes. 2. Polysaccharides, polypeptides, and nucleic acids are all examples of polymers. 3. During translation, amino acids are “activated” by attaching to an appropriate rRNA molecule. 4. The peptide bonds that hold amino acids together in protein molecules are examples of covalent bonds. 5. In double-stranded DNA molecules, the two strands are held together by hydrogen bonds.
The large number of alveoli in lungs improve gas exchange by _____.
A. increasing the concentration difference B. changing the diffusion constant C. decreasing the distance for diffusion D. increasing the surface area for diffusion
Which dissolved gas cannot be transported by hemoglobin?
A. oxygen (O2) B. nitrogen (N2) C. nitric acid (NO) D. carbon monoxide (CO) E. carbon dioxide (CO2)
The intercellular spaces between plant cells
a. contain air. b. are responsible for cytoplasmic streaming. c. produce energy for the cell. d. contain chloroplasts.