Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 3826
TLS Online TPP Program

#Question id: 4039

Which of the following statements is true about a lac operon with this genotype?

I-d O+ Z+ Y- A- ___

#Unit 3. Fundamental Processes

  1. The operon is repressible. 

  2. The operon is nonrepressible.

  3. The mutation is cis-dominant.

  4. The operon is uninducible.

More Questions
TLS Online TPP Program

#Question id: 33984

#Unit 2. Cellular Organization

Choose correct combination of statements 

A. Each chromosome contains many fragments of very long duplex of DNA, folded into a fiber that runs continuously throughout the chromosome.
B. During interphase, euchromatin, which is slightly densely packed than mitotic chromosomes. 
C. Regions of heterochromatin remain densely packed throughout interphase.
D. Various heterochromatic regions, especially those associated with centromeres, aggregate into a densely staining chromocenter
TLS Online TPP Program

#Question id: 2464

#Unit 2. Cellular Organization

What is the function of CapZ and tropomodulin in the sarcomere?
TLS Online TPP Program

#Question id: 12961

#Unit 10. Ecological Principles

Refer to the following experiment, which is designed to test the co evolutionary relationships among an unpalatable butterfly (the  monarch),  a  palatable  butterfly  (the  viceroy),  and  a  butterfly  predator  (the  jay).  Monarch butterflies are reared on three diets: milkweed (their natural food), cabbage, and cabbage treated with an extract from milkweed leaves. Viceroy butterflies, mimics of monarchs, also are reared on three diets: willows (their natural food), cabbage, and cabbage treated with an extract from milkweed leaves. In trial 1 of the first experiment, adult butterflies reared on a particular diet are presented one at a  time  at  1-hour  intervals  to  jays  and  the  jays  are  allowed  to  feed.  Each jay is  fed  until  it refuses to eat the butterfly presented, but no more than 12 butterflies are presented to a jay during a particular test. Five birds are used for each test; therefore, up to 60 butterflies can be consumed for each diet test. The observer records the actual number of butterflies  eaten. In trial 2, the experiment is repeated 2 weeks later. In the second experiment, the butterflies are reared on the same diets as in experiment 1. However, when they are offered to jays, some jays receive a monarch  reared  on  milkweed  before  being  offered  the  butterflies  reared  on  the  experimental  diets;  the  other  group  of jays is  first given a viceroy reared on willow before being  offered the butterflies reared on the experimental diets. The initial butterfly offered is included in the total number eaten, but no more than 12 butterflies are presented to each jay.

The data in the table indicate which of the following?
TLS Online TPP Program

#Question id: 11244

#Unit 10. Ecological Principles

An individual plant that is a monoecious hermaphrodite has
TLS Online TPP Program

#Question id: 16773

#Unit 13. Methods in Biology

What is the Median of the following data sample? 3, 7, 4, 8, 9, 6, 10, 12, 13, 15