Which of the following statements apply to both eukaryotic cell walls and animal cell extracellular matrices? Please select all that apply.

a) They are inflexible structures that support cells.

b) They are built to a common overall structure that can be described as 'fibres in a matrix'.

c) Their protein components are synthesized by ribosomes of the rough endoplasmic reticulum.

d) They limit the diffusion of ions and small molecules into the cell.

#Question id: 4610

#Unit 9. Evolution & Diversity of Life Forms

It has been observed that organisms on islands are different from, but closely related to, similar forms found on the nearest continent. This is taken as evidence that ________.

#Question id: 4611

#Unit 9. Evolution & Diversity of Life Forms

Given what we know about evolutionary biology, we expect to find the largest number of endemic species in which of the following geological features, which have existed for at least a few million years?

#Question id: 4612

#Unit 9. Evolution & Diversity of Life Forms

The greatest number of endemic species is expected in environments that are ________.

#Question id: 4613

#Unit 9. Evolution & Diversity of Life Forms

The questions below refer to the following evolutionary tree, in which the horizontal axis represents time (present time is on the far right) and the vertical axis represents morphological change.  Which species is most closely related to species W?

#Question id: 4614

#Unit 9. Evolution & Diversity of Life Forms

Which of these is the extant (that is, living) species most closely related to species X?

#Question id: 4615

#Unit 9. Evolution & Diversity of Life Forms

Currently, two of the living elephant species (X and Y) are placed in the genus Loxodonta, and a third surviving species (Z) is placed in the genus Elephas. Assuming this classification reflects evolutionary relatedness, which of the following is the most accurate phylogenetic tree?