If all extant organisms have cells, what does this imply about LUCA? Why?

What will be an ideal response?


ANS:
LUCA also must have had a cellular structure. If cell structure evolved after lineages split, then there would be differences in cell structure or other forms of life.

Biology & Microbiology

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Paedomorphosis is

A. the formation of limbs from fins in the evolution of land vertebrates. B. the change from radial to bilateral symmetry in the evolution of plants and animals. C. the retention of juvenile traits in an adult organism. D. an earlier development of adult traits in an organism. E. the development of different types of eyes from a simpler form.

Biology & Microbiology

What cells are phagocytes that can also present antigens to TH cells? 

A. B cells B. macrophages C. plasma cells D. T cells E. monocytes

Biology & Microbiology

Gene flow

a. has a homogenizing influence on a population. b. speeds up the divergence of two populations. c. increases the genetic variation between populations. d. is promoted by isolating mechanisms. e. promotes inbreeding

Biology & Microbiology

In humans, normal skin pigmentation is influenced by a dominant gene (C) which allows pigmentation

to develop. All individuals who are homozygous for the recessive allele (c) are unable to produce an enzyme needed for melanin formation and are therefore referred to as albino. Two normal parents produce an albino child. What are the chances that the next child will be an albino? What will be an ideal response?

Biology & Microbiology