Which of the following statements concerning enzymes is false?
A) They increase the activation energy required for chemical reactions to proceed.
B) They function as catalysts.
C) Many enzymes utilize coenzymes, such as vitamins.
D) The active site of an enzyme has a shape that is specific for its given substrate.
Answer: A
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What is the best test of an evolutionary classification?
Why does the presence of telomeres protect the ends of linear chromosomes?
A. Telomere DNA is resistant to nuclease activity. B. The telomeres represent large "buffer zones" of DNA sequence that do not code for biomolecules. Loss of these sequences is easily tolerated. C. Every time somatic cells replicate, telomerase extends the ends of the chromosomes. D. Specialized telomere-binding proteins prevent loss of DNA during replication. E. None of these choices is correct.
You cut a stalk of celery and put it in a glass of water containing red food coloring overnight. The next morning you observe the celery stalks are now red. This has occurred because the conducted the colored water up through the stalks.
A. phloem B. ground tissue C. xylem D. dermal tissue E. stomata
The presence of short hairs on leaves is controlled by dominant allele H. Plants with genotype hh have smooth leaves. Two parental plants with unknown genotype were crossed. What are the parental genotypes if F1= 0 Hairy and 24 smooth?
a. HH x hh b. Hh x hh c. Hh x Hh d. hh x hh e. HH x HH