Most Gram-positive bacterial cells exhibit which of the following characteristics?
A) Thick layer of peptidoglycan without teichoic acids and large periplasmic space
B) Thick layer of peptidoglycan with teichoic acids and small periplasmic space
C) Thin layer of peptidoglycan without teichoic acids and large periplasmic space
D) Thin layer of peptidoglycan with techoic acids and a small periplasmic space
Ans: B) Thick layer of peptidoglycan with teichoic acids and small periplasmic space
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If a new anesthetic were developed that entered the nerve cells efficiently, why would it be important for the substance to be lipophilic (to dissolve in lipids)?
What will be an ideal response?
Prokaryotic organisms lack
a) cell membranes b) replicator molecules (DNA or RNA) c) organelles d) metabolism e) all of the above answer choices are correct
Sexual reproduction leads to offspring that are all genetically different from one another and from either parent. What are the three aspects of sexual reproduction that lead to this variation?
a) shuffling and reassortment of homologues during mitosis; shuffling and reassortment of homologues during meiosis; and combination of alleles from two parents at fertilization. b) crossing over during the production of zygotes; shuffling and reassortment of homologues during mitosis; and combination of alleles from two parents at fertilization. c) crossing over during the production of gametes; shuffling and reassortment of homologues during mitosis; and combination of alleles from two parents during binary fission. d) crossing over during the production of gametes; shuffling and reassortment of homologues during mitosis; and combination of alleles from two parents at fertilization. e) crossing over during the production of gametes; shuffling and reassortment of homologues during meiosis; and combination of alleles from two parents at fertilization.
Replication of DNA molecule produce
A. Three DNA and one RNA molecules B. One DNA and one mRNA molecules C. Two different molecules of DNA D. One tRNA and one rRNA molecules E. Two exact copies of DNA molecules