QUESTION 5 Although it is rare, some cetacean species have occasional individuals with hind paired flippers in addition to their anterior paired flippers. Mark all answers that correctly describe this phenomenon. forelimb flippers hindlimb flippers These structures are convergent with hind limbs in other mammals as the whale has no ancestors with hind limbs. This is most likely the result of horizontal gene transfer between the whale and another organisms that has hind limbs, such as a sea lion. The most reasonable explanation for this condition is a remnant of the ancestral mechanism for hind limb development, as cetaceans evolved from four legged ancestors. O These structures, when present, could be referred to as vestigial because they are a non-useful remnant of an ancestral structure that was once and important feature. Click Save and Submit to save and submit. Click Save All Answers to save all answers. DD DII F9

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Viral Infections

Viruses are abundantly found, minute entities that have genetic material enclosed within a protein coat. The proteinaceous material enclosing the genetic material of the virus is called a capsid. The genetic material could be either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). A virus is too minute to be looked at with naked eyes and therefore visualized with the help of a microscope. They are acellular entities that require a host for processes, such as replication, transcription, translation and multiplication. Plants, animals, and bacteria act as host wherein the virus reproduce. Viruses cannot multiply outside the host's body and thus are considered nonliving outside the host body.