5. Describe the health damage that STDs can cause. 6. State the symptoms of each of the following STDs: \( \begin{array}{ll}\text { a. chlamydia } & \text { c. HPV } \\ \text { b. gonorrhea } & \text { d. scabies }\end{array} \) \( \begin{array}{l}\text { 7. State the treatment of each of the following STDs: } \\ \begin{array}{ll}\text { a. HIV } & \text { c. trichomoniasis } \\ \text { b. genital herpes } & \text { d. syphilis }\end{array} \\ \text { 8. LIFE SKILI Practicing Wellness List four things } \\ \text { you should do if you suspect you have been } \\ \text { exposed to an STD. }\end{array} \) Critical Thinking 9. Can a person have more than one STD at one

23 Which of the following statements is TRUE about the methylene blue reduction test (MBRT) conducted for pasteurised milk samples? \( \begin{array}{ll}\text { (A) } \quad \text { Microbial load of milk samples can be determined quantitatively. } \\ \text { (B) } \quad \text { Decolourization of methylene blue is caused by the loss of electrons. } \\ \text { (C) A UV-Vis spectrophotometer is required to monitor the colour change. } \\ \text { (D) } \quad \text { Milk sample with longer reduction time is of better quality than sample with } \\ \text { shorter reduction time. }\end{array} \) CC)

3. Which of the ff. is a producer? \( \begin{array}{ll}\text { a. fish } \quad \text { b. shrimp } \quad \text { c. algae } \quad \text { d. crab }\end{array} \) \( \begin{array}{l}\text { 4.All the organisms below are decomposers except } \\ \text { a. fungi } \quad \text { c. bacteria } \\ \text { b. sea lion } \quad \text { d. fungi and bacteria } \\ \text { 5. Arrange the feeding relationship of the ff. organisms living in } \\ \text { intertidal zone }\end{array} \) Fish ------seaweeds------shore birds

22 Which of the following statements about Staphylococcus aureus is correct? \( \begin{array}{ll}\text { (A) } & \text { It is a mesophilic microorganism. } \\ \text { (B) } \quad \text { Cells will appear pink after Gram staining. } \\ \text { (C) } \quad \text { Enterotoxins produced are easily destroyed by heat. } \\ \text { (D) } \quad \text { It does not thrive well in an oxygen-rich environment. }\end{array} \)

Which of the following anterior teeth have a cingulum that is located off-center toward the distal? a) Maxillary lateral incisorb) Maxillary caninec) Mandibular central incisord) Maxillary central incisor

An unknown microbial specimen measures 18 millimetres under a total magnification of 400 x , when examined under the microscope. What is the actual size of the unknown specimen? \( \begin{array}{ll}\text { (A) } 45 \text { micrometres. Total magnification }=400 x \\ \text { (B) } 4.5 \text { micrometres. } \quad \frac{18}{400 x}=0.045 \mathrm{~mm} \\ \text { (C) } 0.45 \text { micrometres. } \\ \text { (D) } 0.045 \text { micrometres. } & \text { micrometers }=0.045 \times 1000=45 \text { micrometers }\end{array} \)