While some animals, such as birds, reproduce sexually, others, such as sponges, produce asexually. Why is it beneficial for a species to reproduce sexually instead of asexually?
A) Sexual reproduction results in offspring that have twice as many chromosomes as the parents, while asexual reproduction produces offspring that have half the number of chromosomes as the parent.
B) Sexual reproduction requires less time and energy than asexual reproduction.
C) Sexual reproduction results in offspring that are genetically identical to the parents, while asexual reproduction results in offspring that are genetically different from the parent.
D) Sexual reproduction results in offspring that are genetically different from the parents, while asexual reproduction results in offspring that are genetically identical to the parent.
Ans: D) Sexual reproduction results in offspring that are genetically different from the parents, while asexual reproduction results in offspring that are genetically identical to the parent.
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All of the following statements reflect the qualities of a safe and effective vaccine, except
A. efficacy must be maintained by booster shots every 5 years. B. the injected material should be antigenic, but not pathogenic. C. it should have a long shelf-life, be cheap to produce, and easy to administer. D. it should confer both humoral and cell-mediated immunity.
What is the approximate number of distinct evolutionary branches in the domain Archaea, as revealed by genome sequencing studies?
a. 3 to 4 b. 9 to 10 c. at least 12 d. at least 20
MT is a 45 year old female who comes to the clinic complaining of more fatigue than normal and constipation. On exam you notice the patient has some dry patches and looks a bit depressed. Her past medical history is significant for GERD for which she takes Dexilant and Maalox. The Labs showed high levels of TSH and low levels of T4. The physician is considering Thyroid medication for MT. Which of the following is considered most appropriate for initial therapy?
a) Armour b) Levothyroxine c) Thyrolar d) RAI 131 e) Propranolol
A botanist identifies a new species of plant that has 32 chromosomes. It grows in the same habitat with three similar species: species A (2n = 14), species B (2n = 16), and species C (2n = 18). Which of the following is a possible mechanism by which the new species could have arisen from the others?
a. Either autopolyploidy due to a nondisjunction in the formation of gametes of species B or allopolyploidy associated with hybridization between species A and C b. Allopatric divergence by development of a mechanical reproductive isolating mechanism c. Autopolyploidy due to a nondisjunction in the formation of gametes of species B d. Allopolyploidy associated with hybridization between species A and C e. Change in a key developmental gene that causes the plants to flower at different times