Which of the following statements is an example of active transport?

1.Dye molecules diffusing after being dropped into a beaker of water.
2.Phospholipids drifting sideways in the plasma membrane.
3.Glucose binding to a transport protein to cross the membrane with the concentration gradient.
4.Calcium pumps in muscle cells transporting calcium against the concentration gradient.


4

Biology & Microbiology

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Choose the correct order of the three main types of cytoskeletal elements in increasing order of size.

A. Microtubules, flagella, cilia B. Actin filaments, intermediate filaments, microtubules C. Microtubules, cilia, flagella D. Actin filaments, intermediate filaments, flagella E. Microtubules, intermediate filaments, actin filaments 

Biology & Microbiology

What is the right description for the muscularis?

A) made of smooth muscle B) contains secretory glands that release enzymes C) part of the peritoneum D) made of connective tissue

Biology & Microbiology

In seed plants, which structure contains the male gametophyte?

a) ovule b) pollen c) seed d) ovary

Biology & Microbiology

Collection of microtubules that assist in the orderly distribution of chromosomes during cell division.

What will be an ideal response?

Biology & Microbiology