Practice Questions

TLS Online TPP Program

#Question id: 31400

During each month of the female sexual cycle, there is a cyclical increase and decrease of FSH and LH, as shown in the figure. Which of the following statement is incorrect regarding uterine cycle?

#Unit 7. System Physiology – Animal

The endometrium increases rapidly in thickness from the 5th to the 14th days of the menstrual cycle.
After 14th days, the endometrium becomes more highly vascularized and slightly edematous under the influence of estrogen and progesterone from the corpus albicans.
Late in the luteal phase, the endometrium, like the anterior pituitary, produces prolactin.
When the corpus luteum regresses, hormonal support for the endometrium is withdrawn about 4 days before the next menses.

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TLS Online TPP Program

#Question id: 3605

#Unit 8. Inheritance Biology

Male Plant blue flower with long pollen was crossed with female plant white flower with long pollen. Analysis of progeny of this cross showed that 50% of the progeny was red with long pollen while the remaining 50% of the progeny was white with long pollen. Which one of the following statements is a possible explanation of the above results?

TLS Online TPP Program

#Question id: 2826

#Unit 2. Cellular Organization

An open reading frame (ORF) is defined as a DNA sequence that

a. begins with a start codon.

b. ends with a stop codon.

c. contains 50 codons.

d. contains approximately an equal frequency of A, T, G, and C.

TLS Online TPP Program

#Question id: 11324

#Unit 10. Ecological Principles

Many temperate lakes develop pronounced thermal stratification during the summer months. In which zone of such lakes does temperature change most rapidly with depth?

TLS Online TPP Program

#Question id: 15820

#Unit 8. Inheritance Biology

Your friends Ben and Jane are contemplating having children and seek your genetic counsel. Ben and Jane are unrelated, but both have younger brothers with the same, extremely rare genetic trait. (In fact, Ben and Jane met at a support group meeting for children and families of children with this rare disorder.) Ben’s parents and Jane’s parents are all unaffected.

Assume that the trait is autosomal recessive with complete penetrance. What is the probability that Ben and Jane’s first child will be affected with the trait? If not affected, what is the probability that the child is a carrier?

TLS Online TPP Program

#Question id: 12369

#Unit 1. Molecules and their Interaction Relevant to Biology

Phosphoric acid attachment occur to ribose or deoxyribose at

A. C3 during phosphodiester bond formation

B. C5 during nucleotide formation

C. C2 during phosphodiester bond formation