Which of the following model organisms is/are LEAST suited to study the timing of morphological changes during embryonic development?

A. Mus musculus
B. Gallus gallus
C. Brachydanio rerio
D. Drosophila melanogaster
E. Mus musculus and Gallus gallus


A. Mus musculus

Biology & Microbiology

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Answer the following statements true (T) or false (F)

1. Bacterial conjugation is also called bacterial sex because there is an equal exchange of genetic information between two cells. 2. Plasmids can help bacteria grow faster. 3. The transfer of genes from dead bacteria to live bacteria is called transformation. 4. It has been difficult to create an effective vaccine against HIV because reverse transcriptase cannot correct its errors.

Biology & Microbiology

The archea include which of the following?

a. extreme thermophiles b. alga c. protista d. animals e. all of these

Biology & Microbiology

These types of compounds are a group of unrelated organic molecules, either water-soluble or fat-soluble, used in the manufacture of final products by acting as coenzymes. 

A. phosphates B. acids C. vitamins D. enzymes

Biology & Microbiology

Which cells are alive at maturity?

A. Sieve elements B. Vessel elements C. Tracheids D. Vessel elements and tracheids E. Sieve elements and vessel elements

Biology & Microbiology