___________, or water bears, have a reduced coelom and molt. Fill in the blank(s) with the appropriate word(s)
Tardigrades
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In a typical atom, the positive charge of each proton is ________
a. expressed by the value of the atomic mass b. countered by the negative charge of each neutron c. neutralized only when the atom bonds to others to form a molecule d. balanced by the negative charge of an equal number of electrons
Which two structures (found in different organisms) both serve to increase the absorptive surfaces of the intestines?
a. choanocytes and gastric ceca b. choanocytes and proventriculus c. proventriculus and villi d. typhlosoles and gastric ceca e. typhlosoles and villi
Which of these is paired incorrectly?
(a) prometaphase - the kinetochores become attached to spindle fibers (b) anaphase - daughter chromosomes migrate toward spindle poles (c) prophase - the nucleolus disappears and the nuclear envelope disintegrates (d) metphase - the chromosomes are aligned in the metaphase plate (e) telophase - a resting phase between cell division cycles
The eye is a warm, moist environment favored by many harmful bacteria. Nevertheless, eye infections are relatively rare. Why is this?
A) Tears contain the antibacterial enzyme lysozyme. B) The eyes are constantly exposed to UV light, which inhibits bacterial growth. C) Antibodies, particularly IgM, are secreted in abundance in the tears. D) The enzyme tearase inhibits bacterial growth.